<template>
  <div>
        <!--    面包屑导航区域-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区 -->
    <el-card>
      <!-- 提示区域 -->
      <el-alert
        title="添加商品信息"
        type="info"
        center
        show-icon
        :closable="false">
        <!-- 步骤条区域 -->
      </el-alert>
        <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
          <el-step title="基本信息"></el-step>
          <el-step title="商品参数"></el-step>
          <el-step title="商品属性"></el-step>
          <el-step title="商品图片"></el-step>
          <el-step title="商品内容"></el-step>
          <el-step title="完成"></el-step>
      </el-steps>
      <!-- tab栏区域 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
        <!-- v-model:绑定值，选中选项卡的 name -->
        <el-tabs :tab-position="'left'" v-model="activeIndex" :before-leave="beforeTabLeave" @tab-click="tabClicked">
          <el-tab-pane label="基本信息" name="0">
            <!-- label:表示你所看到的标签名称，prop：表示校验规则 -->
            <!-- 在 Form 组件中，每一个表单域由一个 Form-Item 组件构成，表单域中可以放置各种类型的表单控件 -->
              <el-form-item label="商品名称" prop="goods_name">
                <el-input v-model="addForm.goods_name" ></el-input>
              </el-form-item>
              <el-form-item label="商品价格" prop="goods_price">
                <el-input v-model="addForm.goods_price"  type="number"></el-input>
              </el-form-item>
              <el-form-item label="商品重量" prop="goods_weight">
                <el-input v-model="addForm.goods_weight"  type="number"></el-input>
              </el-form-item>
              <el-form-item label="商品数量" prop="goods_number">
                <el-input v-model="addForm.goods_number"  type="number"></el-input>
              </el-form-item>
              <el-form-item label="商品分类" prop="goods_cat">
                <el-cascader
                  v-model="addForm.goods_cat"
                  :options="cateList"
                  :props="cateProps"
                  @change="handleChange">
                </el-cascader>
              </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单的item项 -->
            <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
              <!-- 复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox :label="item2" v-for="(item2,index) in item.attr_vals" :key="index" border></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- action:表示图片要上传到后台API地址 -->
            <el-upload
              :action="uploadURL"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :headers="headersObj"
              :on-success="handleSuccess">
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器组件 -->
            <quill-editor v-model="addForm.goods_introduce">
            </quill-editor>
            <!-- 添加商品的按钮 -->
            <el-button type="warning" class="btnAdd" @click="addGoods">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <!-- 图片预览 -->
    <el-dialog
      title="图片预览"
      :visible.sync="previewVisible"
      width="50%">
      <img :src="previewPath" alt="" class="previewImg">
    </el-dialog>
  </div>
</template>

<script>
import _ from "lodash"
export default {
 
  data(){
    return {
      // 通常回 - ‘0’，都是把一个字符类型的数字转换为整形的数字
      activeIndex:'0',
      // 添加商品的表单对象
      addForm:{
        goods_name:'',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品所属的分类数组
        goods_cat: [],
        // 图片的数组
        pics:[],
        //商品的详情描述
        goods_introduce:'',
        attrs:[]
      },
      // 添加商品的表单验证规则对象
      addFormRules:{
        goods_name:[
          {required: true, message:'请输入商品名称', trigger: 'blur'}
        ],
        goods_price:[
          {required: true, message:'请输入商品价格', trigger: 'blur'}
        ],
        goods_weight:[
          {required: true, message:'请输入商品重量', trigger: 'blur'}
        ],
        goods_number:[
          {required: true, message:'请输入商品数量', trigger: 'blur'}
        ],
        goods_cat:[
          {required: true, message:'请选择商品分类', trigger: 'blur'}
        ]
      },
      // 商品分类列表
      cateList:[],
      cateProps:{
        expandTrigger: 'hover',
        label:'cat_name',
        value:'cat_id',
        children:'children'
      },
      // 这是动态参数列表数据
      manyTableData:[],
      // 这是静态属性列表数据
      onlyTableData:[],
      // 上传图片URL地址
      uploadURL:'http://127.0.0.1:8888/api/private/v1/upload',
      // 图片上传组件的headers
      headersObj:{
        Authorization:window.sessionStorage.getItem('token')
      },
      previewPath:'',
      previewVisible:false
    }
  },
  methods:{
    // 获取所有商品分类数据
    async getCateList(){
      const {data:res} = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg)
      }
      this.cateList = res.data
    },
    // 级联选中项变化，会触发这个函数 回调参数：选中节点的值
    handleChange(){
      console.log(this.addForm.goods_cat);
      if(this.addForm.goods_cat.length !== 3){
        this.addForm.goods_cat= []
      }
    },
    beforeTabLeave(aciveName,oldActiveName){
      // console.log('即将离开的标签页是' + oldActiveName);
      // console.log('即将进入的标签页是' + aciveName);
      // return false
      
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请先选择商品分类')
        return false
      }
    },
    // 回调参数：被选中的标签 tab 实例
    async tabClicked(){
      // console.log(this.activeIndex);
      // 证明访问的是动态参数列表
      if (this.activeIndex === '1') {
        const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
          params:{sel:'many'}
        })
        if (res.meta.status !== 200) {
          return this.$message.error(res.meta.msg)
        } 
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        this.manyTableData = res.data
      }
      else if(this.activeIndex === '2'){
        const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
          params:{sel:'only'}})
        if (res.meta.status !== 200) {
          return this.$message.error(res.meta.msg)
        } 
        console.log(res.data);
        this.onlyTableData = res.data
      }
      
    },
    // 处理图片预览效果
    handlePreview(file){
      console.log(file);
      this.previewPath = file.response.data.url
      this.previewVisible = true

    },
    // 处理移除图片的操作
    handleRemove(file){
      console.log(file);
      // 1.获取将要删除图片的临时路径
      const filePath = file.response.data.tmp_path
      // 2.从pics数组中，找到这个图片对应的索引值
      const i = this.addForm.pics.findIndex(item => item.pic === filePath)
      // 3.调用数组的splice方法，把图片信息对象，从pics数组中移除
      this.addForm.pics.splice(i,1)
      console.log(this.addForm);
      
    },
    // 监听图片上传成功的事件：三个参数（response, file, fileList）
    handleSuccess(response){
      console.log(response);
      // 1.拼接得到一个图片信息对象
      const picInfo = { pic : response.data.tmp_path}
      // 2.将图片信息对象push到pic数组中
      this.addForm.pics.push(picInfo)
      console.log(this.addForm);
    },
    addGoods(){
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          return this.$message.error('请填写必要的表单项')
        }
        // 执行添加的业务逻辑 
        // join() 方法用于把数组中的所有元素放入一个字符串。元素是通过指定的分隔符进行分隔的
        // lodash cloneDeep(obj) 返回一个全新的对象 深拷贝
        
        const form =  _.cloneDeep(this.addForm)
        form.goods_cat= form.goods_cat.join(',')
        //处理动态参数
        this.manyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(',')
          }
          this.addForm.attrs.push(newInfo)
        })
        // 处理静态属性
        this.onlyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          }
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs
        console.log(form);
        //发起网络请求，添加商品，商品的名称必须是唯一的
        const {data:res} = await this.$http.post('goods',form)
        console.log(res);
        
        if(res.meta.status !== 201){
          return this.$message.error('添加商品失败')
        }
        this.$message.success('添加商品成功')
        this.$router.push('/goods')
      })
      
    }
  },
  created(){
    this.getCateList()
  },
  computed:{
    cateId(){
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      } else {
        return None
      }
    }
  }
}
</script>

<style lang="less" scoped>
.el-steps{
  margin: 15px 0;
}
.el-step__title{
  font-size: 13px;
}
.el-checkbox{
  margin: 0 5px 0 0 !important;
}
.previewImg{
  width: 100%;
}
.btnAdd{
  margin-top: 15px;
}
</style>